[/a /b /c] ==
[/a /b /c] /a _amember ==
[/a /b /c] /b _amember ==
[/a /b /c] /c _amember ==
[/a /b /c] /d _amember ==
[1 true (abc)] ==
[1 true (abc)] 1 _amember ==
[1 true (abc)] 2 _amember ==
[1 true (abc)] true _amember ==
[1 true (abc)] false _amember ==
[1 true (abc)] (abc) _amember ==
[1 true (abc)] (efg) _amember ==
